[MizunoJoe]

Thanks for the link Par71. Why should impact be before Full Extension of Primary Lever (full uncock)? At that time (impact), PA2 wouldn't matter anyway coz it's PA3 that matters (PA2 power being transferred to clubhead by PA3)?

Oh yes it does matter, because uncocking through impact and not just to impact provides resistance to clubhead velocity drop off due to impact energy losses. Most of the clubhead velocity is provided by the LW(PA2) being uncocked by pivot power(PA4). PA3 is minimal in comparison, Throwout being principally a delivery mechanism.

svs, the golf stroke is not a left handed top-spin backhand, no matter how badly you want it to be.